"There's a sort of a shelf about a hundred feet beyond there.

I'll show you the way." [Illustration: "Those waves will batter her to pieces"] They followed.

Real darkness was coming fast now and Perry found difficulty in retracing his steps.

But in a few minutes, by dint of scrambling and pulling themselves upward, they reached the shelf.

It was barely large enough to hold them all and was scarcely ten feet above the level of the beach below.